Anyone help me with question 20 plz! 30 POINTS!!

a. Independent Variable (I) = Tissue

Dependent Variable (D) = Absorption rate

b. I = Students

D = Reaction time

c. I = Bread

D = Cooking time

Explanation:

In an experiment , the variable being manipulated by an experimenter is known as an independent variable while the dependent variable is the event expected to change when the independent variable is manipulated.

a. Kleenex tissues are more absorbent than homebrand tissue.

In a study measuring the rate of absorption of tissues, the Independent Variable would be the tissue either Kleenex or Homebrand tissue while the rate of absorption or it's absorbent ability is Dependent Variable.

b. Students who plays sport have a faster reaction time than students who do not play sport.

In a study to determine the reaction time of different students with respect to sport, the students is the Independent Variable while the frequency of their reaction is Dependent Variable.

c. White bread cooks faster than multigrain bread.

The cooking time varies with the type of bread. Here the bread is the Independent Variable while the time to cook is Dependent Variable.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.